<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>heart</title>
	<style type="text/css">
        .heart {
            width: 600px;
            height: 600px;
            position: relative;
            margin: 0 auto;
            top: 100px;
        }
        .heart:before {
            content: "";
            position: absolute;
            display: block;
            width: 300px;
            background: #f00;
            height: 600px;
            border-radius: 50% 50% 0 0;
            left: 0;
            top: 0;
            transform-origin: right;
            transform: rotate(-45deg);
        }
        .heart:after {
            content: "";
            position: absolute;
            display: block;
            width: 300px;
            background: #f00;
            height: 600px;
            border-radius: 50% 50% 0 0;
            right: 0;
            top: 0;
            transform-origin: left;
            transform: rotate(45deg);
        }
	</style>
</head>
<body>
	<div class="heart"></div>
</body>
</html>